Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at 2358c by rejecting waste heat to cooling water that enters the condenser at 188c at a rate of 0.25 kg/s and leaves at 268c. the refrigerant enters the condenser at 1.2 mpa and 508c and leaves at the same pressure subcooled by 58c. if the compressor consumes 3.3 kw of power, determine

(a) the mass flow rate of the refrigerant,

(b) the refrigeration load,

(c) the cop

d) the minimum power input to the compressor for the same refrigeration load

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10